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NeuroDynamix IIConcepts of Neurophysiology Illustrated by Computer Simulations$
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W. Otto Friesen and Jonathon Friesen

Print publication date: 2009

Print ISBN-13: 9780195371833

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780195371833.001.0001

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Physical Basis for the Resting Potential

Physical Basis for the Resting Potential

Chapter:
(p.36) I.3 Physical Basis for the Resting Potential
Source:
NeuroDynamix II
Author(s):

W. Otto Friesen

Jonathon A. Friesen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195371833.003.0003

Thanks to the pioneering experiments of the Italian physician Luigi Galvani, it has long been understood that electricity plays a vital role in the functioning of the nervous system. That these electrical signals are intrinsic to animal tissues was demonstrated by the German electrophysiologist du Bois Reymond, who showed that cells have a “resting” potential, the constant voltage across the cell membrane in the absence of stimulation. This chapter describes the Nernst equation, which predicts the strength of electrical potentials that arise from ionic concentrations differences across membranes. The fundamental role of the Nernst equation for electrophysiology is presented in relationship to the parallel conductance model for the cell membrane potential. Basic equations for resting potential, including the role of the electrogenic membrane ion pump, are presented.

Keywords:   resting potential, Nernst equation, parallel conductance model, electrogenic membrane pump, conductance

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